Percentage changes from baseline for relative blood volume (RBV) and mean transit time (mTT) parameters. Agreement between the two parameters obtained to determine perfusion indices. An increase in mTT is suggestive of a decrease in organ perfusion while a increase in RBV is suggestive of an increase in organ perfusion. Changes in RBV and changes in mTT were considered to be consistent when, in a given patient, both parameters increased or decreased by >25% of their baseline value in a direction indicating similar change in blood flow or when one parameter increased or decreased by >25% of its baseline value and the other one was unchanged (<25% change). Grey bars are for patients with chronic hypertension (patients (Pt) 5, 7 and 10).